An arch brace holds the sock in place and adds additional support, while a flat-knit toe seam keeps you comfortable throughout the day. Perfect for moderate hiking or aggressive walking.Merino wool is commonly used in running, hiking, skiing, mountain climbing, cycling, and in other types of outdoor activities because of its excellent temperature regulating, antibacterial, and wicking properties. Merino is not the wool you are used to! It is one of the softest types available due to smaller scales and finer natural fibers for the ultimate comfort. Go farther, faster, and stay dryer in Smartwool!